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Spatiotemporal analysis of coronal loops using seismology of damped kink oscillations and forward modeling of EUV intensity profiles
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Pascoe, D. J. (David J.), Anfinogentov, Sergey, Goddard, Christopher R. and Nakariakov, V. M. (Valery M.) (2018) Spatiotemporal analysis of coronal loops using seismology of damped kink oscillations and forward modeling of EUV intensity profiles. The Astrophysical Journal, 860 (1). 31. doi:10.3847/1538-4357/aac2bc ISSN 1538-4357.
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Official URL: https://doi.org/10.3847/1538-4357/aac2bc
Abstract
The shape of the damping profile of kink oscillations in coronal loops has recently allowed the transverse density profile of the loop to be estimated. This requires accurate measurement of the damping profile that can distinguish the Gaussian and exponential damping regimes, otherwise there are more unknowns than observables. Forward modeling of the transverse intensity profile may also be used to estimate the width of the inhomogeneous layer of a loop, providing an independent estimate of one of these unknowns. We analyze an oscillating loop for which the seismological determination of the transverse structure is inconclusive except when supplemented by additional spatial information from the transverse intensity profile. Our temporal analysis describes the motion of a coronal loop as a kink oscillation damped by resonant absorption, and our spatial analysis is based on forward modeling the transverse EUV intensity profile of the loop under the isothermal and optically thin approximations. We use Bayesian analysis and Markov chain Monte Carlo sampling to apply our spatial and temporal models both individually and simultaneously to our data and compare the results with numerical simulations. Combining the two methods allows both the inhomogeneous layer width and density contrast to be calculated, which is not possible for the same data when each method is applied individually. We demonstrate that the assumption of an exponential damping profile leads to a significantly larger error in the inferred density contrast ratio compared with a Gaussian damping profile.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Sun -- Loop prominences, Magnetohydrodynamics, Solar magnetic fields, Solar oscillations | ||||||||||||||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||
Publisher: | American Astronomical Society | ||||||||||||||||||
ISSN: | 1538-4357 | ||||||||||||||||||
Official Date: | 8 June 2018 | ||||||||||||||||||
Dates: |
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Volume: | 860 | ||||||||||||||||||
Number: | 1 | ||||||||||||||||||
Article Number: | 31 | ||||||||||||||||||
DOI: | 10.3847/1538-4357/aac2bc | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Reuse Statement (publisher, data, author rights): | © 2018. The American Astronomical Society. All rights reserved | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Copyright Holders: | The American Astronomical Society | ||||||||||||||||||
Date of first compliant deposit: | 9 August 2018 | ||||||||||||||||||
Date of first compliant Open Access: | 9 August 2018 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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